System and method for motion detection based on object trajectory

Abstract

A system and method for controlling a device via gesture recognition is disclosed. In one embodiment, the system comprises a video capture device configured to capture video of an object, a tracking module configured to track the position of the object, thereby defining a trajectory, a trajectory analysis module configured to determine whether or not a portion of the trajectory defines a recognized gesture, and a control module configured to change a parameter of the device when it is determined that the trajectory of the object defines a recognized gesture.

1 . A device comprising:
 a video capture device configured to capture video of an object;   a tracking module configured to track the position of the object, thereby defining a trajectory;   a trajectory analysis module configured to determine whether or not a portion of the trajectory defines a recognized gesture; and   a control module configured to change a parameter of the device when it is determined that the trajectory of the object defines a recognized gesture.   
   
   
       2 . The device of  claim 1 , wherein the video capture device comprises a camera. 
   
   
       3 . The device of  claim 2 , wherein the camera is sensitive to infrared light. 
   
   
       4 . The device of  claim 1 , wherein the device comprises a television, a DVD player, a radio, a set-top box, a music player, or a video player. 
   
   
       5 . The device of  claim 1 , wherein the object comprises a human hand. 
   
   
       6 . The device of  claim 1 , wherein the tracking module is configured to perform object recognition. 
   
   
       7 . The device of  claim 1 , wherein the trajectory comprises a sequence of ordered points. 
   
   
       8 . The device of  claim 1 , wherein the recognized gesture comprises at least one of a circular shape or a waving motion. 
   
   
       9 . The device of claim  23 , wherein the parameter of the device is a channel, a station, a volume, a track, or a power. 
   
   
       10 . A method of changing a parameter of a device, the method comprising:
 receiving video of an object;   defining a trajectory of the object, based on the received video;   determining if the trajectory of the object defines a recognized gesture; and   changing a parameter of the device when it is determined that the trajectory of the object defines a recognized gesture.   
   
   
       11 . The method of  claim 10 , wherein defining a trajectory of the object comprises:
 analyzing a plurality of frames of the video to determine, for each of the plurality of frames, the portion of the frame which shows the object; and   defining a center location for each of the plurality of frames based, at least, on the portion of the frame which shows the object.   
   
   
       12 . The method of  claim 11 , wherein defining a center location for each of the plurality of frames comprises defining a motion center location for the object. 
   
   
       13 . A device comprising:
 means for receiving video of an object;   means for defining a trajectory of the object, based on the received video;   means for determining if the trajectory of the object defines a recognized gesture; and   means for changing a parameter of the device when it is determined that the trajectory of the object defines a recognized gesture.   
   
   
       14 . A programmable storage device comprising code which, when executed, causes a processor to perform a method of changing a parameter of a device, the method comprising:
 receiving video of an object;   defining a trajectory of the object, based on the received video;   determining if the trajectory of the object defines a recognized gesture; and   changing a parameter of the device when it is determined that the trajectory of the object defines a recognized gesture.